The WeighTrainer

Circumference Bodyfat / Lean Body Mass Calculator

The following calculator gives you an estimate of your % bodyfat and lean body mass based on your weight, height, age and simple tape measurements (i.e. anthropometric measurements). Skin-fold measurements alone tend to underestimate body fat percentage in the obese [1] and very lean (particularly with low hydration levels). The following calculator is based on equations [2, 3] which are useful for people in these groups as well as people with loose skin after very large weight loses. It is generally accurate to within a few percent. Anecdotally, it has also proven to be reasonably accurate with drug-free, genetically typical bodybuilders.

Age – your age in years

Height – your height without shoes

Waist size – measure around your waist at your navel and also at the point midway between your navel and the bottom of your sternum, and take the average of these two measurements - that is your "Waist" measurement. Stand tall, but do not deliberately suck in your stomach or the estimation will be wrong.

Iliac – measure around where your upper pelvic bones protrude the most (you can feel for them on either side of your waist/hips)

Hips – measure around the hips at the maximum protrusion of the buttocks